// sortable
.sortable() {
  display: inline-block;
  width: 9px;
  height: 12px;
  margin-left: 4px;
  margin-top: -1px;
  vertical-align: middle;
  overflow: hidden;
  cursor: pointer;
  position: relative;

  i {
    display: block;
    height: 6px;
    line-height: 6px;
    overflow: hidden;
    position: absolute;
    color: @btn-disable-color;
    transition: color @transition-time @ease-in-out;

    &:hover {
      color: inherit;
    }

    &.on {
      color: @primary-color;
    }

    &:first-child {
      top: 0;
    }

    &:last-child {
      bottom: 0;
    }
  }
}
